Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 |  |
VRS Castricum | 9 May | |
VRS Castricum | 9 June | |||
| 2020 | |
VRS Castricum | 5 May | |
VRS Castricum | 8 August | |||
| 2019 | |
VRS Castricum | 25 May | |
VRS Castricum | 9 August | |||
| 2018 | |
VRS Castricum | 5 May | |
VRS Castricum | 13 August | |||
| 2017 | |
VRS Castricum | 2 May | |
VRS Castricum | 3 June | |||
| 2016 | |
VRS Castricum | 8 May | |
VRS Castricum | 7 June | |||
| 2015 | |
VRS Castricum | 8 May | |
VRS Castricum | 24 July | |||
| 2014 | |
VRS Castricum | 16 May | |
VRS Castricum | 21 June | |||
| 2013 | |
VRS Castricum | 19 May | |
VRS Castricum | 2 August | |||
| 2012 | |
VRS Castricum | 20 May | |
VRS Castricum | 12 August | |||
| 2011 | |
VRS Castricum | 7 May | |
VRS Castricum | 22 August | |||
| 2010 | |
VRS Castricum | 6 June | |
VRS Castricum | 6 June | |||
| 2009 | |
VRS Castricum | 1 May | |
VRS Castricum | 14 July | |||
| 2008 | |
VRS Castricum | 27 April | |
VRS Castricum | 4 May | |||
| 2007 | |
VRS Castricum | 26 April | |
VRS Castricum | 25 May | |||
| 2006 | |
VRS Castricum | 4 May | |
VRS Castricum | 11 June | |||
| 2005 | |
VRS Castricum | 26 May | |
VRS Castricum | 28 May | |||
| 2004 | |
VRS Castricum | 16 May | |
VRS Castricum | 31 May | |||
| 2003 | |
VRS Castricum | 9 May | |
VRS Castricum | 2 June | |||
| 2002 | |
VRS Castricum | 17 May | |
VRS Castricum | 2 June | |||
| 2001 | |
VRS Castricum | 26 May | |
VRS Castricum | 27 May | |||
| 2000 | |
VRS Castricum | 13 May | |
VRS Castricum | 16 May | |||
| 1999 | |
VRS Castricum | 20 May | |
VRS Castricum | 28 May | |||
| 1998 | |
VRS Castricum | 9 May | |
VRS Castricum | 6 August | |||
| 1997 | |
VRS Castricum | 15 May | |
VRS Castricum | 18 May | |||
| 1996 | |
VRS Castricum | 2 June | |
VRS Castricum | 7 June |
